相老师，我想问下如果以后工作主要是数据清理，对深入现在学习的知识（主要是OLTP方面的）有帮助吗？还有就是数据清洗能学到什么技术啊？希望相老师指点迷津啊。 ...

这一周都在忙着搭建rac,环境如下:linux系统,镜像是as5.iso;clusterware;oracle 10.2.0 clusterware已经安装好,oracle软件也安装好了,也成功升级到10.2.5了 问题:以oracle用户执行dbca和netca命令的时候没有报错,但系 ...

The NOT EXISTS and NOT IN Constructs In this section we will discuss how Oracle evaluates NOT EXISTS and NOT IN clauses, prerequisites for using Oracle’s anti-join access paths, and hints that influ ...

Semi-Join Example #2 I recently worked on a project where applying the concepts presented in this section brought the execution time for a key query in my client’s application down from 46 minutes t ...

dba_tab_privs：用户的对象权限（不仅仅是表的权限，所有对象的权限都包含在里面）dba_sys_privs：用户的系统权限 dba_role_privs：用户的角色 我们可能还想知道角色包含的权限 role_role_privs role_sys_privs ro ...

Prerequisites and Hints that Impact Semi-Joins There are a few situations in which Oracle cannot use a semi-join access path. If the query contains a DISTINCT operation (explicitly or implicitly thro ...

The EXISTS and IN Constructs In this section we will discuss how Oracle evaluates EXISTS and IN clauses, prerequisites for using Oracle’s semi-join access paths, and hints that influence semi-join q ...

首先找出库里大于1G的表，作为监视的对象，大约有80个。 我们库里的表是每天一更新。我想在每天更新所有后，记录下监视表的当天的状态，包括表的记录数、表的大小（单位G）、表对应索引大小（单位G），放在一个统计 ...